Johnson City planning panel approves stricter data‑center rules after hours of public comment

Johnson City — After more than an hour of public testimony and detailed staff presentations, the Johnson City Regional Planning Commission approved a zoning text amendment on June 9 that establishes new preconstruction noise and vibration analyses, measurable operational standards, annual compliance verification and a 200-foot separation between data‑center property lines and residences.

The amendment, presented by Whitney Hodges, planning manager, and Keith Martin, city planner, frames data centers as a permitted use in I‑2 industrial zones but requires a special‑exception review by the Board of Zoning Appeals (BZA). Martin said the rules were developed from a 2025 ordinance, a city‑commissioned ambient noise study at 10 sites, outreach and a consultant report. "Data centers operate 24/7, they have massive cooling systems and generators that are primary concerns to the public," Martin said during the presentation, adding the measures aim to be "reasonable, rational and defensible." (Keith Martin, planner)

Why the decision matters: Residents and multiple speakers at the public hearing argued the city needs enforceable standards and stronger shutdown authority if a facility harms nearby people or property. Dave Adams, a resident who spoke during public comment, told the commission the draft "calls for a 200‑foot separation from residential properties, but it does not apply that same separation standard to churches [or] daycares" and urged clearer, legally defensible standards and early shutdown tools. "We need authority to pull the plug early if we expect to have true oversight," Adams said. (Dave Adams, public commenter)

Key provisions and safeguards - Definitions and scope: The amendment defines "data centers" and "accessory data centers," and captures related operations such as Bitcoin mining. - Technical studies: Applicants must submit preconstruction ambient noise and predictive noise/vibration studies prepared by a qualified acoustical engineer and utility capacity verification (power, water, wastewater). The city may require additional environmental and infrastructure analyses. - Setbacks and buffering: Data centers would be limited to I‑2 zones and must meet a 60‑foot front setback, 50‑foot side/rear setbacks and a 200‑foot minimum separation from residential uses or districts measured property‑line to property‑line. - Board review and public transparency: Proposed sites receive BZA public hearings; adjacent owners within 200 feet are notified and projects must post a public project website with construction schedules and study results during building and initial operation. - Ongoing compliance: Annual operational verification is required at license renewal; failures may lead the BZA to withhold renewal and eventually revoke permission to operate. Staff described an independent technical‑review process for submitted studies and an annual reporting and public‑notification system.

Public concerns and staff responses Residents repeatedly urged larger residential separations (some cited 500–1,500 feet used elsewhere) and asked for explicit shutdown authority. Martin and Whitney Hodges said the city sought a middle ground: larger buffers might effectively exclude data centers from the city, while a 200‑foot property‑line separation, combined with objective noise/vibration performance standards and annual reviews, provides enforceable, site‑specific protections. Hodges said the draft is intended to be a living regulatory framework; technical guidelines (noise/vibration parameters and testing protocols) will be kept as an updatable guidance document.

Other issues raised at the hearing included utility demand and who pays for grid or water upgrades. Martin said state law and the proposed rules require applicants to secure written verification from utility providers that adequate capacity exists and to fund necessary infrastructure improvements or mitigation for their facility.

Vote and next steps Commissioner (speaker 11) moved to approve the amendment; the motion was seconded and carried on roll call. Recorded votes were: Commissioner Aldridge — yes; Commissioner Goodson — yes; Commissioner Mead — no; Commissioner Williams — yes; Commissioner Goetz — yes; Vice Chair Kelly — no; Chair Denton — yes. The commission approved the text amendment and staff will carry the proposal to the city commission for subsequent readings and the city’s municipal code amendments (the noise ordinance) will be processed separately.

What to watch: staff and consultants will finalize the noise and vibration guideline parameters and the city will continue public outreach. The moratorium on permitting remains in place through December (as referenced by staff) while guidelines and implementation steps are finalized.

Ending The vote was the result of a multi‑year effort that included a consultant noise study, a working group, public surveys and multiple workshops. Supporters of stricter rules said the package is the most comprehensive approach the city has had to date; opponents said they want stronger setbacks and explicit early shutdown authority.